【題目】The police ___________ for the missing girl for a day since they received the call for help.
A.searching
B.have searched
C.searched
D.to search

【答案】B
【解析】句意:自從警察接到求助電話,他們就尋找失蹤女孩已經(jīng)一天了。searching 尋找,搜尋,是動名詞形式;have searched現(xiàn)在完成時,已經(jīng)尋找;searched搜尋,過去式;to search是動詞不定式形式。句中since引導的是時間狀語從句,從句中用一般過去時態(tài),主句用現(xiàn)在完成時。故應(yīng)選B。

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